aerial view of the smallest bothy shelter in the uk (grwyne fawr, brecon beacons, wales

grwyne fawr wales aerial view bannau brycheiniog black mountain bothy brecon beacons camping cloudy countryside dramatic environment fresh water hike hiking hill house hut lake landscape monmouthshire mountains mynydd ddu national park nature outdoor remote reservoir river rural scenic shelter stormy summer travel trekking uk united kingdom valley walking waun fach welsh wilderness